-41.09% is the change from 550 to 324
Calculation steps:
[( 324 - 550 ) ÷ 550] x 100 = -41.09%
Formula
Percentage change = [(324 - 550) / 550] x 100
Subtract the new number by the original number
324 - 550 = -226
-226 ÷ 550 = -0.4109090909090909
-0.4109090909090909 x 100 = -41.09%